Besides using sand casting, casting method can also be used for precision casting process to obtain a smooth surface, size precision products.For synthetic ammonia and ethylene cracking in high temperature furnace tube often adopt the method of centrifugal casting.Heat treatment of bead light body heat strong after normalizing or quenched and tempered steel is usually used;In quenched and tempered martensite heat-resistant steel processing, to stabilize the organization, get good comprehensive mechanical properties and high temperature strength.Heat resistant steel back cupping ferritic steel production line can't through strengthening heat treatment.To eliminate because of cold plastic deformation caused by machining and welding stress, can be conducted in 650 ~ 830 ℃ annealing treatment, rapid cooling after annealing, so as to rapidly after 475 ℃ brittle temperature range.